The top five teams are now Texas, Oregon, Penn State, Ohio State, and Georgia.
Warren had another record-breaking day against the Trojans.
"It was unbelievable and an absolute dream come true."
Warren now holds the single-game school record for most receptions by an offensive player, passing DaeSean Hamilton who had 14 receptions in a game in 2014.
Ryan Barker's walk-off overtime field goal completed Penn State's comeback.
Singleton is Penn State's leading rusher with 53 carries, 408 yards, and three touchdowns.